it all depends on the material your rims are made of. i have 18s and they are heavy as fawk. so i'm guessing they are made of some strong material. my friend has 17s on his civic, but his rims are made of that light weight ****. (i can't think right now of the names). we drive on the same roads and such so theres a constant. the only changed variables are tire size and the rims material. he has thicker tires than i do, but his are still dent all over the place. i'm sorry if you guys don't understand what i'm saying.